JPH0348423B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a heat storage hot water supply equipment, and more specifically,
The present invention relates to a heat storage hot water supply facility that stores heat held by a heat medium supplied from a solar heat collector or the like as hot water and supplies hot water as needed.

Heat-storage water heating equipment is known that can supply hot water using heat obtained from solar collectors or waste heat from heat pumps, and store excess heat as hot water to meet hot water demand and space heating demand. In this type of thermal storage hot water supply equipment, the hot water storage tank that stores the water to be heated is
It may be placed under the floor of a house because the area under the floor is less affected by changes in outside temperature.
Therefore, in order to secure a certain amount of heat storage capacity and provide stable hot water supply, it is necessary to secure a certain amount of hot water storage tank capacity, for example, a capacity of around 400 liters is required even for general household use. , the shape of the hot water storage tank placed under the floor must be flat. In other words, a flat shape is advantageous for effectively utilizing the space under the floor.
In addition, it is difficult to dig into the soil under the floor and place a vertical hot water storage tank because it is a heavy construction work.

By the way, if the hot water storage tank is made flat, the height of the hot water storage tank will be low relative to the overall capacity of the hot water storage tank, and the temperature difference in the height direction of the heated water in the hot water storage tank will tend to be small. ,Also,
Heat exchange with the heat exchanger (radiator) occurs only in a part of the tank, which tends to create dead areas around the tank. Therefore, sufficient natural convection of the heated water within the tank due to the temperature difference in the height direction of the heated water could not be expected. Therefore, the heat exchange efficiency was low, and the entire capacity of the hot water storage tank could not be used effectively.

Furthermore, not only when a flat hot water storage tank is placed under the floor, heat exchange efficiency may be low due to insufficient natural convection within the hot water storage tank.

An object of the present invention is that even if the hot water storage tank has a flat shape, the overall convection of the heated water in the hot water storage tank is sufficient, so that the heat exchange efficiency is high. The objective is to provide heat storage hot water supply equipment with excellent capacity and hot water supply capacity.

Therefore, the present invention provides a floating means for a heat exchanger having a heat medium flow path connected to an external heat source and through which a heat medium from the heat source passes, and a heated flow path capable of exchanging heat with the heat medium flow path. is arranged floating above the heated water in the hot water storage tank, one end of the heated flow path is open in the hot water storage tank, and the other end of the heated flow path has a switching means and a forced water supply means. The switching means is connected to the circulation flow path and the hot water supply flow path through the switching means, and the switching means is provided to selectively communicate the heated flow path with the circulation flow path or the hot water supply flow path, and the switching means is connected to the circulation flow path and the hot water supply flow path. The end opposite to the switching means is open to the bottom side of the hot water storage tank, and the end of the hot water supply flow path opposite to the switching means is configured to be connected to a water heater.

In other words, the heat exchanger is placed near the surface of the heated water in the hot water storage tank, where it is most likely to reach the highest temperature, so that even if the liquid level fluctuates, the heat exchanger is always positioned so that it follows the fluctuations. During heat storage, hot water from the bottom side (low temperature side) of the hot water storage tank is supplied to the other end of the inner pipe by the circulation means and forcedly circulated to the heat exchanger, thereby adjusting the temperature of the heat exchanger and the hot water. The difference is ensured to improve heat exchange efficiency, and the heated hot water is sequentially discharged near the liquid surface, and when hot water is being supplied, the heated water from the upper side (higher temperature side) in the hot water storage tank is supplied by the hot water supply means. so that the highest temperature heated water in the tank is supplied to the water heater,
Furthermore, when hot water is supplied, the water to be heated in the hot water storage tank is passed through the exchanger, the temperature is raised again if necessary, and then the water is supplied to the water heater, thereby achieving the above purpose. be.

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 shows an embodiment of the heat storage water heater according to the present invention. In the figure, a floor 2 of a building 1 such as a general residence is supported on a cloth foundation 3, and the space under the floor is covered with cloth. Several underfloor spaces 4 are defined by the foundation 3.

A hot water storage tank 5 is installed in one of the underfloor spaces 4. The hot water storage tank 5 is formed into a bag shape from a synthetic resin sheet or the like with insulation quilting pasted on the outer circumferential surface, and a cap 6 is attached to the opening of the hot water storage tank 5.
A lid body 7 is attached via. On the other hand, floor 2
has an opening 9 to which a lid 8 is removably attached.
The control equipment, piping, etc. of the hot water storage tank 5 can be maintained through this opening 9, and the tank 5 can be folded into a small size inside the underfloor space 4. It is now possible to store it.

A predetermined amount of heated water 11 is filled in the hot water storage tank 5, and the head pressure of the heated water 11 causes the hot water storage tank 5 to be expanded into a flat shape. In addition, the hot water storage tank 5, which has expanded into a flat shape,
It is placed on the floor subfloor 13 via a heat insulating mat 12. The hot water storage tank 5 is surrounded by the cloth foundation 3, but the hot water storage tank 5 and the cloth foundation 3 are
A heat insulating material 14 such as foamed beads is filled in the gap between the hot water storage tank 5 and the cloth foundation 3 through the heat insulating material 14.

Heated water 11 in the hot water storage tank 5 is supplied into the tank 5 through a water supply pipe 15 . The water supply pipe 15 is connected to a ball tap 16 attached to the upper end of the tank 5, and an introduction pipe 17 whose tip water supply port faces the bottom of the hot water storage tank 5 is connected to the ball tap 16, and water is supplied from the water supply pipe 15. The water to be heated 11 is supplied to the bottom side of the hot water storage tank 5 through the ball tap 16 and the introduction pipe 17, and the filled volume of the water to be heated 11 in the hot water storage tank 5 reaches a predetermined amount by the action of the ball tap 16. configured to be maintained.

A heat exchanger 21 is disposed floating above the heated water 11 in the hot water storage tank 5. As the floating means, a floating (air chamber, air pool) 21A, etc. may be attached to the heat exchanger 21, or,
The heat exchanger 21 may be suspended from the lid 7 by a tension coil spring (not shown) or the like so that it remains in a predetermined position. The heat exchanger 21 has a double tube structure, and a heat medium pipe 23 is connected to an outer case 22 which is a heat medium flow path, and is mounted on the roof of the building 1 through the heat medium pipe 23. A solar heat collector 24 as an external heat source is connected thereto. A heat medium circulation pump 25 is provided in the middle of the heat medium pipe 23, and this pump 25 circulates the solar heat collector 24 and the outer case 22 of the heat exchanger 21.
The structure is such that a heat medium is appropriately circulated between the two.

In addition, the heat medium pipe 23 introduced into the inside of the hot water storage tank 5 has flexibility or condensability, so that when the liquid level of the heated water 11 in the hot water storage tank 5 changes, Also, the heat exchanger 21 is always positioned above the heated water 11 in accordance with the above-mentioned fluctuations.

On the other hand, the inner tube 2 which is the heated flow path of the heat exchanger 21
6 has one end open to the heated water 11 in the hot water storage tank 5, and the heated water 11 flows through the inside of the heated water 11. It is configured to perform heat exchange. Note that the inner tube 26 may be designed to have a spiral shape or meander so that the contact area (contact time) between the heated water 11 and the heat medium is secured to a predetermined amount or more. .

A first port 31A of a first three-way switching valve 31 and a first port 32A of a second three-way switching valve 32, which are switching means, are connected to the other end of the inner pipe 26 via a circulation pipe 30. . The portion of the circulation pipe 30 inside the hot water storage tank 5 also has flexibility or elasticity, similar to the portion of the heat medium pipe 23 inside the hot water storage tank 5. The second port 31B of the first three-way switching valve 31 is connected to the circulation pipe 33.
The third port 31C is connected to a hot water pump 34, which is a forced water supply means, through a pumping pipe 35.
It is connected to the pumping pipe 36 via. The lower end opening of the pumping pipe 36 is arranged on the bottom side of the hot water storage tank 5, and the pumping pipe 36 and the pumping pipe 35 constitute a circulation flow path.
Heated water 11 at the bottom inside the hot water storage tank 5 is pumped up. In addition, the first
The three-way switching valve 31 is equipped with a valve switching motor 37, and this motor 37 switches between the first port 31A and the second port 31B during hot water supply (operation).
During heat storage (operation), the second port 3
The valve switching operation is performed so that the third port 1B and the third port 31C are communicated with each other.

On the other hand, the second port 32B of the second three-way switching valve 32 is connected to the thermowax valve 41 via the hot water supply pipe 38, which is a flow path for hot water supply, and the third port 32C is connected to the hot water supply via the circulation pipe 33. It is connected to the pump 34. Further, the second three-way switching valve 32 is equipped with a valve switching motor 39, and when the valve switching operation is performed by this valve switching motor 39, the first port 32A and the third port are connected to each other during heat storage (operation). The port 32C is communicated with the second port 32B and the third port 3 during hot water supply (operation).
2C.

The hot water supply pipe 38 is branched into two at the thermowax valve 41, and one of the hot water supply pipes 38 is interposed with a proportionally controlled water heater 42. After the bifurcated hot water pipe 38 is connected again, the water heater 4 such as a shower or a hot water faucet is connected.
Connected to 3.

Note that the three-way switching valves 31, 32, the hot water supply pump 34, and the pumping pipe 36 constitute a circulation means for forcibly circulating the heated water on the bottom side of the hot water storage tank 5 to the heat exchanger 21 during heat storage, and When hot water is supplied by the three-way switching valves 31, 32 and the hot water supply pump 34, the heated water 1 in the upper side of the hot water storage tank 5 is heated.
1 to the water heater 43 is configured.

Next, the operating method of this embodiment will be explained with reference to FIGS. 2 and 3.

FIG. 2 shows the paths of the heat medium and heated water 11 during heat storage operation. During heat storage,
In the case of the first switching valve 31, the valve is switched so that the second port 31B and the third port 31C communicate with each other, and in the case of the second three-way switching valve 32, the valve is switched so that the second port 31B and the third port 31C communicate with each other.
The valve is switched so that the port 32A and the third port 32C communicate with each other. As a result, the pumping pipe 36
Low-temperature heated water 11 on the bottom side of the hot water storage tank 5 is pumped up from the lower end opening, and this pumped heated water 11 is passed through two switching valves 31 and 32 and a hot water pump 34 to a circulation pipe. 30 to the other end of the inner tube 26 of the heat exchanger 21. The water to be heated 11 supplied to the inner pipe 26 is heated by exchanging heat with the high-temperature heat medium circulating in the outer case 22, and then flows through the inner pipe 26 to the upper side (liquid level side) of the hot water storage tank 5. be discharged. At this time, the heated water 11 that exchanges heat with the high-temperature heat medium in the heat exchanger 21 is the low-temperature water at the bottom side of the hot water storage tank 5 pumped up by the pumping pipe 36, so that they exchange heat with each other. The temperature difference between the heated water 11 and the heat medium is large, resulting in high heat exchange efficiency.

FIG. 3 shows a route during hot water supply operation, and in this case, in the case of the first three-way switching valve 31, the first port 31A and the second port 31B communicate with each other, and the second three-way switching valve 31 communicates with the first port 31A and the second port 31B. In the case of the switching valve 32, the second port 32B and the third port 32C are communicated. During hot water supply, the high-temperature heated water 11 in the upper part of the hot water storage tank 5 passes through the inner pipe 26 of the heat exchanger 21.
After being sucked into the interior, two three-way switching valves 31, 32
The water is then supplied to the thermowax valve 41 via the hot water pump 34. That is, the heated water 11 at the highest temperature part in the hot water storage tank 5 is supplied to the thermowax valve 41; It passes through the heat exchanger 21, receives the heat of the heat medium, and is further heated.

If the temperature of the heated water 11 supplied to the thermowax valve 41 is lower than a predetermined value, the heated water 11 is supplied to the water heater 4 via a proportional control type water heater 42.
If the temperature is already higher than a predetermined value, the water is supplied directly to the water heater 43 without passing through the proportional water heater 42.

In addition, when the water to be heated 11 in the water heater 43 is consumed in the water heater 43 and the liquid level in the hot water storage tank 5 falls, the ball tap 16 is opened and new water to be heated 11 is stored through the introduction pipe 17. The hot water is supplied near the bottom of the tank 5, and the liquid level within the hot water storage tank 5 is always kept constant.

While the amount of heated water 11 consumed by the water heater 43 is greater than the amount introduced from the introduction pipe 17, the liquid level in the hot water storage tank 5 will fall, but the heat exchanger 21 Since the heat exchanger 21 is floating on the upper side of the liquid level, the heat exchanger 21 also lowers as the liquid level falls, and when the liquid level rises, the heat exchanger 21 also lowers the liquid level. rises in line with the rise in Therefore, the heated water 11 in the hottest part of the hot water storage tank 5 is always supplied to the water heater 43 (regardless of fluctuations in the liquid level).

According to this embodiment, during the heat storage operation, the heated water 1 at the lowest temperature in the hot water storage tank 5 is
1 is supplied to the heat exchanger 21, the heat exchange efficiency in the heat exchanger 21 is high. Therefore, even when the shape of the hot water storage tank 5 is flat and sufficient natural convection cannot be expected. , has the effect of high heat storage capacity. In particular, in this embodiment, the hot water pump 34
Since the heat exchange is performed by forced circulation, heat exchange can be performed throughout the hot water storage tank 5 by circulating flow, rather than by partial heat exchange within the hot water storage tank 5. Furthermore, the water to be heated 11 heated by heat exchange is discharged near the liquid surface, and the upper part of the hot water storage tank 5 is heated to a high temperature, and the high temperature part is extracted from the bottom and is gradually directed toward the bottom by forced circulation. Once expanded, the entire interior of the hot water storage tank 5 is heated to a high temperature, further improving heat storage efficiency.

Furthermore, even during hot water supply operation, the heated water 11 in the upper part of the tank 5, which is the highest temperature part of the hot water storage tank 5, is supplied to the water heater 43. (Heated water 1
1) is obtained, and the hot water supply capacity is also excellent. Moreover, the heat exchanger 21 is connected to the hot water storage tank 5.
Since it is configured to follow the displacement of the liquid level, the hot water supply capacity can always be maintained despite fluctuations in the liquid level, and the temperature of hot water in the water heater 43 also follows the displacement of the liquid level. can be stabilized regardless of

Furthermore, a hot water storage tank 5 that is supplied to the water heater 43
The heated water 11 on the upper side further receives heat from the heat medium in the heat exchanger 21, and then is transferred to the water heater 4.
3, and from this point of view as well, the hot water supply capacity can be excellent.

Furthermore, by arranging the heat exchanger 21 in the hot water storage tank 5, the heat of the heat medium radiated from the outer case 22 is transferred to the heated water 11 around the heat exchanger 21.
Therefore, heat storage capacity and hot water supply capacity can be improved in this respect as well. Moreover, when the heat exchanger 21 is installed outside the hot water tank 5, for example, a heat insulating material, a heat retention mechanism, etc. are required to prevent the heat held by the heat medium from being radiated to the outer circumferential side of the outer case 22. heat exchanger 2
1 in the hot water storage tank 5, it is extremely convenient as there is no need for heat insulating material or the like.

In addition, a flexible hot water storage tank 5 is arranged in the underfloor space 4 defined by the cloth foundation 3, and the cloth foundation 3 is effectively utilized to form a heat insulating layer in the underfloor space 4 and to expand the hot water storage tank 5. We are having them undergo shape restorative surgery, etc.
It has the effect of being easy to construct without requiring extensive construction. In addition, by arranging the heat transfer pipe 23 outside the building 1 and communicating with the hot water storage tank 5 only by penetrating the fabric foundation 3, damage caused by an accidental leakage is limited to the outdoors. Also, it is easy to repair.

In addition, when implementing hot water supply, the heat exchanger 21
The heated water 11 on the upper side of the hot water storage tank 5 is simply transferred to the water heater 4 without passing the heat medium from the heat collector 24 to the water heater 4.
3 may be supplied. However, if the temperature of the heat medium is higher than the water to be heated 11, the temperature of the water to be heated 11 can be further increased as described above by passing this heat medium through the heat exchanger 21.

Further, heat radiation from the lid 7 may be particularly prevented by attaching a heat insulating material to the lid 7 or placing foam beads or the like on the lid 7. In addition, heat exchanger 2
1 is a double-tube structure, but the present invention is not limited to this. For example, the heat medium flow path is formed in a spiral shape to form a single circular tube structure, and the center of this circular tube structure is located inside the inner tube. The heated water 11 corresponds to the pipe 26.
Alternatively, the water to be heated 11 may be passed through the outer case 22 as an inner pipe, and a heat medium similar to the inner pipe 26 in the above embodiment may be disposed at the center thereof. It may have a structure in which a heat medium is circulated through the passage, or it may have a triple-pipe structure.

In addition, although the heat medium circulated in the heat exchanger 21 is the heat medium whose temperature has been raised by the solar heat collector 24, it is possible to use instead of the solar heat collector 24, or
Any heat collection source can be used, such as one that connects the exhaust heat side of a heat pump with the solar heat collector 24 and also uses the exhaust heat of the heat pump, or one that uses geothermal heat, domestic waste heat, etc., and is specified in the above case. It is not something that will be done. Further, a coil or the like may be arranged in the hot water storage tank 5 in addition to the heat exchanger 21, and a heater or the like may be operated by the heat collected by the coil or the like in the hot water storage tank 5.

In addition, the hot water storage tank 5 is not limited to a flexible, flat-shaped tank that is placed under the floor, but may also be a tank that is placed somewhere other than under the floor, is vertically long, or is a rigid tank that maintains a certain shape. It's okay. Furthermore, the proportional water heater 42 is not necessarily required.

As described above, according to the present invention, it is possible to provide a heat storage hot water supply facility with high heat exchange efficiency and excellent heat storage capacity and hot water supply capacity.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of the heat storage hot water supply device according to the present invention, and FIGS. 2 and 3 show the paths of the heat medium and heated water during the heat storage operation and hot water supply operation of the embodiment, respectively. FIG. 1...Building, 2...Floor, 3...Fabric foundation, 4...
... Underfloor space, 5... Hot water tank, 11... Heated water, 12... Insulating mat, 13... Subfloor surface,
14...Insulation material, 15...Water supply pipe, 16...
Ball tap, 17...Introduction pipe, 21...Heat exchanger, 21A...Float as floating means, 22...
Outer case serving as a heat medium flow path, 23...Heating medium pipe, 24...Solar heat collector serving as an external heat source, 25
... heat medium circulation pump, 26 ... inner pipe as heated flow path, 30 ... circulation pipe, 31, 32 ... first and second three-way switching valves as switching means, 31A,
32A...1st port, 31B, 32B...2nd port
Port, 31C, 32C...Third port, 33...
...Circulation pipe, 34...Hot water pump which is a forced water supply means, 35, 36...A pumping pipe and pumping pipe which are circulation channels, 38...Hot water pipe which is a hot water supply channel, 41...Thermowax Valve, 42...proportional control water heater, 43...water heater.

Claims (1)

[Claims] 1. A heat exchanger having a heat medium flow path connected to an external heat source and through which a heat medium from the heat source passes, and a heated flow path capable of exchanging heat with the heat medium flow path. It is placed floating above the heated water in the hot water storage tank by floating means, one end of the heated flow path is open in the hot water storage tank, and the other end of the heated flow path is connected to the switching means and the forced water supply. The switching means is connected to the circulation flow path and the hot water supply flow path via means, and the switching means is provided to selectively communicate the heated flow path with the circulation flow path or the hot water supply flow path, and the switching means is connected to the circulation flow path and the hot water supply flow path. A thermal storage hot water supply facility characterized in that an end of the hot water supply flow path opposite to the switching means is open to the bottom side of the hot water storage tank, and an end of the hot water supply flow path opposite to the switching means is connected to a water heater. . 2. Claim 1, wherein the heated flow path of the heat exchanger is disposed to penetrate into the heat medium flow path, so that the heat exchanger has a double structure. Thermal storage hot water equipment described in .